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Comparison of cold pressor and exercise radionuclide angiocardiography in coronary artery disease
Insights
The cold pressor test (CPT) aids in diagnosing coronary artery disease (CAD) by showing reduced heart function. This noninvasive test is valuable for patients unable to exercise.
Area of Science:
- Cardiology
- Diagnostic Imaging
Background:
- Coronary artery disease (CAD) diagnosis relies on invasive and noninvasive methods.
- Exercise stress testing is a common noninvasive approach but challenging for some patients.
Purpose of the Study:
- To evaluate the cold pressor test (CPT) using radionuclide angiocardiography for diagnosing CAD.
- To assess the functional cardiac response to CPT compared to exercise.
Main Methods:
- Radionuclide angiocardiography performed on 52 patients (18 normal, 34 with CAD).
- Measurements taken at rest, during CPT, and during supine bicycle exercise (EX).
- Left ventricular ejection fraction (EF) and regional wall motion (dyssynergy) were assessed.
Main Results:
- In CAD patients, EF decreased significantly during CPT (p < 0.01) but not significantly during EX.
- CPT induced new or worsening dyssynergy in 79% of CAD patients, compared to 73% during EX.
- Normal subjects showed no change in EF during CPT but an increase during EX.
Conclusions:
- The cold pressor test is a useful noninvasive tool for diagnosing and functionally evaluating CAD.
- CPT is particularly beneficial for patients unable to complete a standard exercise test.
- Radionuclide angiocardiography combined with CPT provides valuable diagnostic information for CAD.
Abstract:
To investigate the role of the cold pressor test (CPT) with radionuclide angiocardiography in the diagnosis of coronary artery disease (CAD), we performed angiocardiography in 52 patients (18 with angiographically normal coronary arteries and 34 with CAD) during the resting state, CPT, and supine bicycle exercise (EX). In normal subjects, left ventricular ejection fraction (EF) was unchanged between rest (58 +/- 9%) and CPT (59 +/- 9%, p = ns), but increased during maximal EX (69 +/- 9%, p less than 0.01). In CAD patients, EF fell from 55 +/- 9% at rest to 49 +/- 9% during CPT (p less than 0.01), and to 53 +/- 11% during EX (p = ns vs. rest). Twenty-seven CAD patients (79%) developed new or worsening areas of dyssynergy during CPT, vs. 25 patients (73%) during EX. Thus, the cold pressor test with radiocardiography appears to be a useful noninvasive test for the diagnosis and functional evaluation of CAD, particularly in patients unable to perform a satisfactory exercise test.